import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DButil {
    private static final String URL="jdbc:mysql://127.0.0.1:3306/message?characterEncoding=utf-8&useSSL=true";
    private static final String username="root";
    private static final String password="w15029100455..";
    private static  volatile DataSource dataSource=null;
    public static DataSource getDataSource(){
        if (dataSource==null) {
            synchronized (DButil.class) {
                if(dataSource==null){
                    dataSource=new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setURL(URL);
                    ((MysqlDataSource)dataSource).setUser(username);
                    ((MysqlDataSource)dataSource).setPassword(password);
                }
            }
        }
        return dataSource;
    }
    public static Connection getConnection() throws SQLException {
        return getDataSource().getConnection();
    }
    public static void close(Connection connection, PreparedStatement statement, ResultSet resultSet){
        if(resultSet!=null){
            try {
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(statement!=null){
            try {
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(connection!=null){
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}
